From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Requesting an order for eight large batten lamp holders to be used for transformer insulation testing.
| Identifier | ExFiles\Box 32\4\ Scan035 | |
| Date | 16th December 1920 | |
| To Tolly . from EFC. X 1581 EFCl/T16.12.20. X.1109 [crossed out] X.1581 RE LAMP HOLDERS FOR LAMP BOARD FOR CONTROL OF TRANSFORMER FOR INSULATION TESTING. Would you kindly arrange to have ordered up for us eight large size batten lamp holders. These are for the purpose of fixing on boards, six on one and two on the other, to effect control of the primary voltage for the insulating testing on of transformer. A similar set should also be obtained for use with the transformer for production testing of insulating materials. EFC. | ||